1樓:邊緣
(1)100+120÷15,
=100+8,
=108;
(2)2.25×
4.8+7.75×4.8,
=4.8×(2.25+7.75),
=4.8×10,
=48;
(3)3
16-5
8÷4,
=316
-532,=6
32-532,
=132
;(4)16×2
5÷(56?3
4),=16
×25÷(10
12-9
12),
=115
÷112,=1
15×12,=45.
脫式計算(能簡算的要簡算) 2.5×7.1×4 16.12×99+16.12 5.2×0.9+0.9×4.8 [113-(34.15+3
2樓:誒呀
(1)2.5×7.1×4,
=(2.5×4)×7.1,
=10×7.1,
=71;
(2)16.12×99+16.12,
=16.12×(99+1),
=16.12×100,
=1612;
(3)5.2×0.9+0.9×4.8,
=0.9×(5.2+4.8),
=0.9×10,
=9;(4)[113-(34.15+38.25)]÷2,=[113-72.4]÷2,
=40.6÷2,
=20.3;
(5)3.6÷(1.2+0.6)×0.5,=3.6÷1.8×0.5,
=2×0.5,
=1;(6)4.82÷0.25+1.25÷0.25,=4.82×4+1.25×4,
=19.28+5,
=24.28.
脫式計算.(能簡算的用簡算)(1)25×4.4(2)7.7×0.16÷7.7×12.5 (3)10.64÷(3.7-2.9)(4)4.8
3樓:手機使用者
(1)25×
4.4,
=25×4+25×0.4,
=100+10,
=110;
(2)7.7×0.16÷7.7×12.5,=7.7÷7.7×0.8×0.2×12.5,=1×0.2×12.5×0.8,
=0.2×10,
=2;(3)10.64÷(3.7-2.9),=10.64÷0.8,
=13.3;
(4)4.8×99+4.8,
=4.8×(99+1),
=4.8×100,
=480;
(5)47.3+21×(3.9-0.87),=47.3+21×3.03,
=47.3+63.63,
=110.93;
(6)5×[(68.41-32.17)÷0.4],=5×(36.24÷0.4)
=5×90.6,
=453.
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